Chapter VI

Appendix to

NOTE I. (p. 215).

Amount of Potash in Different Minerals.

Felspars—
	Percentage of potash.
(a) Orthoclase	{ 9.11	10.28	11.07	12.12	12.47
	{ 13.49	14.35	15.21	16.7
(b)Oligoclase	0.50
(c)Labradorite	0.33
Mica	{ 5.61	6.20	7.23	8.26	8.95
	{ 9.00	10.25	12.40	13.15
Amphibole	0.25	2.96
Pyroxene	0.34	2.48
Leucite	13.60	18.61
Zeolites	0.30	9.35	0.98	4.93

Stassfurt potash salts—	Per cent.
(a) Polyhallite, potassium sulphate	28
(b) Karnallite (KCl.MgCl₂6H₂₀), potassium chloride	24 to 27
(c) Sylvin, pure potassium chloride.
(d) Kainit (K₂SO₄MgSO₄MgCl₂6H₂O), potassium sulphate	32
(e) Schoenite (K₂SO₄, MgSO₄, 6H₂O), pure potassium magnesium sulphate.

NOTE II. (p. 217).

The quantity of potash obtainable from various plants in the manufacture of potashes on a large scale is illustrated by the following statements. 1000 lb. of the following vegetative products yield the following quantities of potashes:—

	lb.
Old spruce-wood	1/2
Old poplar-wood	3/4
Old oak-wood	1-1/2
Corn-stalks	17-1/2
Bean-stalks	20
Grape-vine	40
(Storer, ‘Agricultural Chemistry,’ vol. ii. p. 108.)

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